pandas Combine Excel Spreadsheets

This is one way to do it -- load all sheets into a dictionary of dataframes and then concatenate all the values in the dictionary into one dataframe.

import pandas as pd

Set sheetname to None in order to load all sheets into a dict of dataframes and ignore index to avoid overlapping values later (see comment by @bunji)

df = pd.read_excel('tmp.xlsx', sheet_name=None, index_col=None)

Then concatenate all dataframes

cdf = pd.concat(df.values())

print(cdf)